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Pregnancy Due Date Calculator : Estimated Delivery Date & Trimester Timeline

The Pregnancy Due Date Calculator calculates your estimated due date (EDD) using standard medical Naegele’s Rule based on your Last Menstrual Period (LMP) and menstrual cycle length. It provides full trimester milestones and gestational age tracking.

Interactive Calculator

100% Client-Side Engine
Estimated Delivery Date (EDD)
May 6, 2027
1st Trimester (Weeks 1-12) • 224 days remaining
Gestational Age8 Weeks, 0 Days (20%)
Estimated Conception
Aug 13, 2026
LMP + 14 days
Current Trimester
Trimester 1
40 weeks total
Days Remaining
224
Until 40 weeks
Calculation Method
Naegele's Rule
Clinical standard
Pregnancy Trimester & Ultrasound Milestones
Conception Window
Week 2
Aug 13, 2026
End of 1st Trimester
Week 12
Oct 22, 2026
Anatomy Ultrasound Scan
Week 20
Dec 17, 2026
Viability Milestone
Week 24
Jan 14, 2027
Start of 3rd Trimester
Week 27
Feb 4, 2027
Early Term
Week 37
Apr 15, 2027
Estimated Due Date (Full Term)
Week 40
May 6, 2027

Step-by-Step Examples

Standard 28-Day Cycle Calculation

LMP on January 1, 2025 with standard 28-day cycle.

Inputs: LMP Date: 2025-01-01, Cycle Length: 28 Days
Result: Estimated Due Date: Wednesday, October 8, 2025 (40 Weeks Full Term)

Calculates 280-day gestation with 1st, 2nd, and 3rd trimester milestones.

How to Use This Tool

  1. Enter the first day of your Last Menstrual Period (LMP).
  2. Specify your average menstrual cycle length (default 28 days).
  3. Click Calculate to see your Estimated Due Date, current gestational week, trimester status, and key scan milestones.

Frequently Asked Questions

About 5% of babies are born on their exact estimated due date, with the majority arriving between 37 and 42 gestational weeks.

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